JP2017194582A - Display device, and manufacturing method of display board - Google Patents
Display device, and manufacturing method of display board Download PDFInfo
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- JP2017194582A JP2017194582A JP2016085011A JP2016085011A JP2017194582A JP 2017194582 A JP2017194582 A JP 2017194582A JP 2016085011 A JP2016085011 A JP 2016085011A JP 2016085011 A JP2016085011 A JP 2016085011A JP 2017194582 A JP2017194582 A JP 2017194582A
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V9/00—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters
- F21V9/14—Elements for modifying spectral properties, polarisation or intensity of the light emitted, e.g. filters for producing polarised light
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F21—LIGHTING
- F21V—FUNCTIONAL FEATURES OR DETAILS OF LIGHTING DEVICES OR SYSTEMS THEREOF; STRUCTURAL COMBINATIONS OF LIGHTING DEVICES WITH OTHER ARTICLES, NOT OTHERWISE PROVIDED FOR
- F21V11/00—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00
- F21V11/16—Screens not covered by groups F21V1/00, F21V3/00, F21V7/00 or F21V9/00 using sheets without apertures, e.g. fixed
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B30/00—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images
- G02B30/20—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes
- G02B30/22—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type
- G02B30/25—Optical systems or apparatus for producing three-dimensional [3D] effects, e.g. stereoscopic images by providing first and second parallax images to an observer's left and right eyes of the stereoscopic type using polarisation techniques
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
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- G—PHYSICS
- G02—OPTICS
- G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
- G02B5/00—Optical elements other than lenses
- G02B5/30—Polarising elements
- G02B5/3025—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state
- G02B5/3058—Polarisers, i.e. arrangements capable of producing a definite output polarisation state from an unpolarised input state comprising electrically conductive elements, e.g. wire grids, conductive particles
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133509—Filters, e.g. light shielding masks
- G02F1/133512—Light shielding layers, e.g. black matrix
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
- G02F1/133538—Polarisers with spatial distribution of the polarisation direction
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/133528—Polarisers
- G02F1/133548—Wire-grid polarisers
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/13—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on liquid crystals, e.g. single liquid crystal display cells
- G02F1/133—Constructional arrangements; Operation of liquid crystal cells; Circuit arrangements
- G02F1/1333—Constructional arrangements; Manufacturing methods
- G02F1/1335—Structural association of cells with optical devices, e.g. polarisers or reflectors
- G02F1/13356—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements
- G02F1/133562—Structural association of cells with optical devices, e.g. polarisers or reflectors characterised by the placement of the optical elements on the viewer side
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- G—PHYSICS
- G09—EDUCATION; CRYPTOGRAPHY; DISPLAY; ADVERTISING; SEALS
- G09F—DISPLAYING; ADVERTISING; SIGNS; LABELS OR NAME-PLATES; SEALS
- G09F13/00—Illuminated signs; Luminous advertising
- G09F13/04—Signs, boards or panels, illuminated from behind the insignia
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Nonlinear Science (AREA)
- Mathematical Physics (AREA)
- Crystallography & Structural Chemistry (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Theoretical Computer Science (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Illuminated Signs And Luminous Advertising (AREA)
- Instrument Panels (AREA)
- Liquid Crystal (AREA)
- Polarising Elements (AREA)
Abstract
Description
本発明は、表示装置、表示板の製造方法に関する。 The present invention relates to a display device and a method for manufacturing a display plate.
従来の技術として、同一表示面上に相異なる図形等を表示切換えできる表示装置が知られている（例えば、特許文献１参照）。この表示装置は、２つの光源と、これらの各々の光源の前方に個々設けられた偏光方向が互いに直角をなす２つの光源偏光板と、これらの光源偏光板の前方に互いに重ね合わせて設けられ偏光方向が互いに直角をなすとともに表示図形あるいは文字等を切り欠いて透光部となした２つの表示偏光板よりなり、２つの光源の点灯の点灯切換により表示切換する表示切換灯として構成されている。 As a conventional technique, a display device capable of switching display of different graphics on the same display surface is known (for example, see Patent Document 1). This display device is provided with two light sources, two light source polarizing plates individually provided in front of each of the light sources and perpendicular to each other, and in front of these light source polarizing plates. It consists of two display polarizing plates whose polarization directions are perpendicular to each other and cut out display figures or characters to form a translucent part, and is configured as a display switching lamp that switches the display by switching the lighting of the two light sources. Yes.
この表示装置によれば、同一表示面上に相異なる図形等を表示切換えできるものであるため、表示面のスペースが少なくてすみ、従来の同一目的の表示切換灯に比較して簡単な構成で明瞭な表示が得られるとされている。 According to this display device, since different figures can be displayed on the same display surface, the space on the display surface can be reduced and the structure is simpler than that of a conventional display switch for the same purpose. It is said that a clear display can be obtained.
しかし、特許文献１の表示装置は、２つの光源の前方に各々設けられた偏光方向が互いに直角をなす２つの光源偏光板を必要としていた。また、表示偏光板の表示図形あるいは文字等を切り欠いて透光部を形成するので、切り欠いた部分と切り欠かない部分との透過率が異なり、表示図形あるいは文字等のコントラストに影響して表示性能が低下するという問題があった。 However, the display device of Patent Document 1 requires two light source polarizing plates provided in front of two light sources and having polarization directions perpendicular to each other. In addition, since the translucent part is formed by cutting out the display figure or characters of the display polarizing plate, the transmittance of the notched part and the non-notched part is different, affecting the contrast of the display figure or characters. There was a problem that display performance deteriorated.
従って、本発明の目的は、一枚の表示板で偏光による切替表示が可能な表示装置、表示板の製造方法を提供することにある。 Accordingly, an object of the present invention is to provide a display device capable of switching display using polarized light with a single display plate, and a method for manufacturing the display plate.
［１］上記目的を達成するため、吸収軸の方向が異なることで偏光方向が異なる複数の領域を有して表示領域が構成される表示板と、第１吸収軸の方向、又は、前記第１吸収軸と直交する第２吸収軸の方向に偏光方向を有する照明光を照射する光源と、を有し、前記表示領域は、前記第１吸収軸の方向に偏光微細加工された領域を有する第１領域と、前記第２吸収軸の方向に偏光微細加工された領域を有する第２領域と、前記照明光が透過する第３領域とにより構成され、前記第２吸収軸の方向に偏光方向を有する前記照明光の照射により前記第１領域及び前記第３領域のみを前記表示部に表示し、前記第１吸収軸の方向に偏光方向を有する前記照明光の照射により前記第２領域及び前記第３領域のみを前記表示部に表示することを特徴とする表示装置を提供する。 [1] In order to achieve the above object, a display panel having a plurality of regions having different polarization directions due to different directions of the absorption axis, and a direction of the first absorption axis, or the first A light source that emits illumination light having a polarization direction in the direction of the second absorption axis perpendicular to the one absorption axis, and the display region has a region that is polarized and micromachined in the direction of the first absorption axis A first region, a second region having a region finely polarized in the direction of the second absorption axis, and a third region through which the illumination light is transmitted, the polarization direction in the direction of the second absorption axis Only the first region and the third region are displayed on the display unit by irradiation of the illumination light having the second light source, and the second region and the third region by irradiation of the illumination light having a polarization direction in the direction of the first absorption axis. Only the third region is displayed on the display unit. To provide a display device.
［２］前記第１領域及び前記第３領域による表示と、前記第２領域及び第３領域による表示とは、前記表示板の上で前記第３領域において重複していることを特徴とする上記［１］に記載の表示装置であってもよい。 [2] The display by the first area and the third area and the display by the second area and the third area overlap in the third area on the display board. The display device according to [1] may be used.
［３］また、前記第１領域から第３領域以外の領域では、前記照明光が透過しない遮光部を有することを特徴とする上記［１］又は［２］に記載の表示装置であってもよい。 [3] Further, in the display device according to [1] or [2], the region other than the first region to the third region includes a light shielding portion that does not transmit the illumination light. Good.
［４］上記目的を達成するため、前記基板の第１領域において、偏光機能を有するように第１吸収軸の方向に偏光微細加工を行なうと共に、前記基板の第２領域において、偏光機能を有するように前記第１吸収軸と直交する第２吸収軸の方向に偏光微細加工を行なう偏光微細加工工程と、を有することを特徴とする表示板の製造方法を提供する。 [4] In order to achieve the above object, the first region of the substrate has a polarization function in the direction of the first absorption axis so as to have a polarization function, and the second region of the substrate has a polarization function. Thus, there is provided a method for manufacturing a display panel, comprising: a polarization micromachining step of performing polarization micromachining in the direction of a second absorption axis perpendicular to the first absorption axis.
本発明によれば、一枚の表示板で偏光による切替表示が可能な表示装置を提供することが可能となる。 ADVANTAGE OF THE INVENTION According to this invention, it becomes possible to provide the display apparatus which can be switched and displayed by polarized light with one display board.
（本発明の実施の形態に係る表示装置１の構成）
図１（ａ）は、本発明の実施の形態に係る表示装置の概略構成を示す構成図であり、図１（ｂ）は、表示装置をＡ方向から見たとき、表示部に音符マークが表示された場合の図であり、図１（ｃ）は、表示装置をＡ方向から見たとき、表示部に矢印マークが表示された場合の図である。図２は、偏光微細加工された表示板の部分詳細を示す斜視図である。また、図３（ａ）は、表示板の上平面図であり、図３（ｂ）は、表示板の側面図である。以下、これらの図に基づいて、本発明の実施の形態に係る表示装置１の構成を説明する。
(Configuration of display device 1 according to the embodiment of the present invention)
FIG. 1A is a configuration diagram showing a schematic configuration of a display device according to an embodiment of the present invention, and FIG. 1B shows a note mark on the display unit when the display device is viewed from the A direction. FIG. 1C is a diagram in a case where an arrow mark is displayed on the display unit when the display device is viewed from the A direction. FIG. 2 is a perspective view showing a partial detail of a display panel that has undergone polarization micromachining. 3A is a top plan view of the display panel, and FIG. 3B is a side view of the display panel. Hereinafter, the configuration of the display device 1 according to the embodiment of the present invention will be described based on these drawings.
図１（ａ）〜（ｃ）に示すように、本発明の実施の形態に係る表示装置１は、吸収軸の方向が異なることで偏光方向が異なる複数の領域を有して表示領域が構成される表示板１００と、第１吸収軸Ｂの方向、又は、第１吸収軸Ｂと直交する第２吸収軸Ｃの方向に偏光方向を有する照明光を照射する光源２０と、を有し、表示領域は、第１吸収軸Ｂの方向に偏光微細加工された領域を有する第１領域１０２ａと、第２吸収軸Ｃの方向に偏光微細加工された領域を有する第２領域２０２ａと、照明光が透過する第３領域である重複領域３００と、により構成され、第２吸収軸Ｃの方向に偏光方向を有する照明光の照射により第１領域１０２ａ及び第３領域である重複領域３００のみを前記表示板１００に表示し、第１吸収軸Ｂの方向に偏光方向を有する照明光の照射により第２領域２０２ａ及び第３領域である重複領域３００のみを表示板１００に表示する、ように構成されている。 As shown in FIGS. 1A to 1C, the display device 1 according to the embodiment of the present invention has a plurality of regions having different polarization directions due to different directions of the absorption axis, and the display region is configured. And the light source 20 that irradiates illumination light having a polarization direction in the direction of the first absorption axis B or the direction of the second absorption axis C orthogonal to the first absorption axis B, The display region includes a first region 102a having a region finely polarized in the direction of the first absorption axis B, a second region 202a having a region finely polarized in the direction of the second absorption axis C, and illumination light. And the overlapping region 300 that is a third region through which the first region 102a and the third region are overlapped only by the irradiation of illumination light having a polarization direction in the direction of the second absorption axis C. Displayed on the display panel 100, the polarization direction in the direction of the first absorption axis B Only overlap region 300 which is the second region 202a and the third region for displaying on the display panel 100 by irradiation of the illumination light is configured as.
なお、第１領域から第３領域以外の領域、すなわち、第１領域１０２ａ、第２領域２０２ａ、及び第３領域である重複領域３００以外の領域では、照明光が透過しない、又は、透過率が小さい遮光部１１０を有する。この遮光部１１０は、第１吸収軸、第２吸収軸の両方向の照明光を遮蔽する遮光膜が形成され、マーク部の表示動作においてコントラストをつけて表示するためのものである。 In areas other than the first area to the third area, that is, the areas other than the first area 102a, the second area 202a, and the overlapping area 300, which is the third area, the illumination light does not transmit or has a transmittance. A small light shielding part 110 is provided. The light-shielding portion 110 is formed with a light-shielding film that shields illumination light in both directions of the first absorption axis and the second absorption axis, and is used for display with a contrast in the display operation of the mark portion.
（光源２０）
光源２０（第１光源２１、第２光源２２）は、例えば、レーザ光、ＬＥＤ光等が使用できる。光源２０（第１光源２１、第２光源２２）は、例えば、レーザ光の場合は特定の方向に偏光成分を有するように偏光方向を調整し、また、ＬＥＤ光等では特定の方向に偏光成分を有するように出射部に偏光素子を配置する。光源２０は、図１（ａ）に示すように、表示板１００の第２吸収軸の方向（矢印Ｃ方向）に偏光方向を有する第１光源２１と、表示板１００の第１吸収軸の方向（矢印Ｂ方向）に偏光方向を有する第２光源２２とから構成されている。第１光源２１から表示板１００に向かって第１照明光２１ａを照射して照明し、第２光源２２から表示板１００に向かって第２照明光２２ａを照射して照明する。
(Light source 20)
As the light source 20 (the first light source 21 and the second light source 22), for example, laser light, LED light, or the like can be used. For example, in the case of laser light, the light source 20 (first light source 21 and second light source 22) adjusts the polarization direction so as to have a polarization component in a specific direction, and in the case of LED light or the like, the polarization component is in a specific direction. A polarizing element is disposed in the light emitting portion so as to have As shown in FIG. 1A, the light source 20 includes a first light source 21 having a polarization direction in the direction of the second absorption axis of the display panel 100 (the direction of arrow C), and the direction of the first absorption axis of the display panel 100. It is comprised from the 2nd light source 22 which has a polarization direction in (arrow B direction). The first illumination light 21a is irradiated from the first light source 21 toward the display panel 100 to illuminate, and the second illumination light 22a is irradiated from the second light source 22 toward the display panel 100 for illumination.
なお、光源２０が楕円偏光または円偏光の光源の場合は、例えば、光源２０の出射部に光軸に対して相対的に回転可能な偏光素子を配置し、光源２０と偏光素子を回転させることにより、表示板１００の第２吸収軸の方向（矢印Ｃ方向）に偏光方向を有する第１照明光２１ａと、表示板１００の第１吸収軸の方向（矢印Ｂ方向）に偏光方向を有する第２照明光２２ａを生成して、表示板１００に向かって照明光を照射して照明する構成でもよい。 In the case where the light source 20 is an elliptically or circularly polarized light source, for example, a polarizing element that can rotate relative to the optical axis is disposed at the emission portion of the light source 20, and the light source 20 and the polarizing element are rotated. Thus, the first illumination light 21a having the polarization direction in the direction of the second absorption axis of the display panel 100 (arrow C direction) and the first illumination light having the polarization direction in the direction of the first absorption axis of the display panel 100 (arrow B direction). A configuration may be adopted in which two illumination lights 22a are generated and illuminated by irradiating illumination light toward the display panel 100.
（表示板１００）
表示板１００は、図２に示すように、ガラス基板４００ａ上に金属層４００ｂ（例えば、Ｃｒ、Ａｌ）が形成された基板４００において、金属層４００ｂがその厚さ方向に偏光微細加工された複数の領域を有して表示領域が構成されている。この複数の領域は、吸収軸の方向が異なることで偏光方向が異なる領域とされている。
(Display board 100)
As shown in FIG. 2, the display panel 100 includes a plurality of substrates 400 in which a metal layer 400b (eg, Cr, Al) is formed on a glass substrate 400a, and the metal layer 400b is subjected to polarization micromachining in the thickness direction. The display area is configured with the following areas. The plurality of regions have different polarization directions due to different absorption axis directions.
金属層４００ｂは、山部４０２ａと谷部４０２ｂが交互に並んでブレード部４０２が所定の間隔で配列されるように、金属層４００ｂの一部が偏光微細加工により除去されて形成されている。このブレード部４０２が延伸する方向は吸収軸４１０である。すなわち、吸収軸４１０と平行な偏光成分の光は吸収され、吸収軸４１０と直交する偏光成分の光は透過する。したがって、この偏光微細加工された領域は、偏光機能を有する。 The metal layer 400b is formed by removing a part of the metal layer 400b by polarization micromachining so that the peak portions 402a and the valley portions 402b are alternately arranged and the blade portions 402 are arranged at a predetermined interval. The direction in which the blade portion 402 extends is the absorption shaft 410. That is, light having a polarization component parallel to the absorption axis 410 is absorbed, and light having a polarization component orthogonal to the absorption axis 410 is transmitted. Therefore, this polarized microfabricated region has a polarization function.
（マーク部）
図１（ａ）に示す表示板１００上の音符マーク部１０２は、図３（ａ）に示す第１領域１０２ａと第３領域である重複領域３００から構成されている。また、矢印マーク部２０２は、図３（ａ）に示す第２領域２０２ａと第３領域である重複領域３００から構成されている。
(Mark part)
The note mark portion 102 on the display board 100 shown in FIG. 1A is composed of a first area 102a and an overlapping area 300 which is a third area shown in FIG. Moreover, the arrow mark part 202 is comprised from the 2nd area | region 202a shown to Fig.3 (a), and the overlapping area | region 300 which is a 3rd area | region.
音符マーク部１０２の第１領域１０２ａは、図２で示したブレード部４０２の吸収軸４１０が、図３（ａ）に示すように、第１吸収軸の方向（矢印Ｂ方向）に形成されている。したがって、第１領域１０２ａは、第２吸収軸の方向（矢印Ｃ方向）に偏光方向を有する第１光源２１は透過するが、第１吸収軸の方向（矢印Ｂ方向）に偏光方向を有する第２光源２２は透過しない。 In the first region 102a of the note mark portion 102, the absorption axis 410 of the blade portion 402 shown in FIG. 2 is formed in the direction of the first absorption axis (arrow B direction) as shown in FIG. Yes. Therefore, the first region 102a transmits the first light source 21 having the polarization direction in the direction of the second absorption axis (arrow C direction), but the first region 102a has the polarization direction in the direction of the first absorption axis (arrow B direction). The two light sources 22 do not transmit.
矢印マーク部２０２の第２領域２０２ａは、図２で示したブレード部４０２の吸収軸４１０が、図３（ａ）に示すように、第２吸収軸の方向（矢印Ｃ方向）に形成されている。したがって、第２領域２０２ａは、第１吸収軸の方向（矢印Ｂ方向）に偏光方向を有する第２光源２２は透過するが、第２吸収軸の方向（矢印Ｃ方向）に偏光方向を有する第１光源２１は透過しない。 In the second region 202a of the arrow mark portion 202, the absorption axis 410 of the blade portion 402 shown in FIG. 2 is formed in the direction of the second absorption axis (arrow C direction) as shown in FIG. Yes. Accordingly, the second region 202a transmits the second light source 22 having the polarization direction in the direction of the first absorption axis (arrow B direction), but has the polarization direction in the direction of the second absorption axis (arrow C direction). One light source 21 does not transmit.
第３領域である重複領域３００は、音符マーク部１０２と矢印マーク部２０２に共通する部分である。この重複領域３００は、照明光の偏光状態に関わらずに照明光が透過する。なお、この重複領域３００の照明光の透過率は、第１領域１０２ａまたは第２領域２０２ａを照明光が透過する場合の透過率とほぼ同じとなるように設定される。重複領域３００の偏光微細加工時において、ブレード部を形成しない加工により、図２で示す所定の深さまで除去することで、上記説明した所定の透過率に設定することができる。 The overlapping area 300 as the third area is a part common to the note mark part 102 and the arrow mark part 202. The overlapping region 300 transmits the illumination light regardless of the polarization state of the illumination light. Note that the transmittance of the illumination light in the overlapping region 300 is set to be substantially the same as the transmittance when the illumination light is transmitted through the first region 102a or the second region 202a. At the time of the polarization micromachining of the overlapping region 300, the predetermined transmittance described above can be set by removing to the predetermined depth shown in FIG. 2 by processing without forming the blade portion.
遮光部１１０は、金属層４００ｂが加工されない未加工部である。遮光部１１０は、例えば、表示板１００の表面に、第１領域１０２ａ、第２領域２０２ａ、及び第３領域である重複領域３００以外の領域に形成されている。遮光部１１０は、第１吸収軸、第２吸収軸の両方向の照明光を遮蔽する。これにより、マーク部の表示動作において、マーク部をコントラストよく表示することができる。 The light shielding part 110 is an unprocessed part where the metal layer 400b is not processed. For example, the light shielding unit 110 is formed on the surface of the display panel 100 in a region other than the first region 102a, the second region 202a, and the overlapping region 300 that is the third region. The light shielding unit 110 shields illumination light in both directions of the first absorption axis and the second absorption axis. Thus, the mark portion can be displayed with good contrast in the display operation of the mark portion.
（表示装置１の表示動作）
（表示板１００に音符マーク部１０２を表示する場合）
図１（ａ）で示す表示装置１において、第１光源２１を点灯させ、第２光源２２を消灯させる。表示板１００は、表示板１００の第２吸収軸の方向（矢印Ｃ方向）に偏光方向を有する第１光源２１のみで照明される。音符マーク部１０２の第１領域１０２ａは、第１吸収軸の方向（矢印Ｂ方向）にブレード部４０２が形成されているので、第２吸収軸の方向（矢印Ｃ方向）に偏光方向を有する第１光源２１は透過するが、第１吸収軸の方向（矢印Ｂ方向）に偏光方向を有する第２光源２２は透過しない。よって、第１照明光２１ａは、第１領域１０２ａを透過する。また、第１照明光２１ａは、第３領域である重複領域３００を透過する。一方、第１照明光２１ａは、遮光部１１０及び第２領域２０２ａは透過しない。これにより、図１（ｂ）で示すように、表示板１００において、音符マーク部１０２のみが表示され、それ以外の部分は表示されない。
(Display operation of display device 1)
(When displaying the note mark portion 102 on the display board 100)
In the display device 1 shown in FIG. 1A, the first light source 21 is turned on and the second light source 22 is turned off. The display panel 100 is illuminated only by the first light source 21 having a polarization direction in the direction of the second absorption axis of the display panel 100 (arrow C direction). In the first region 102a of the note mark portion 102, since the blade portion 402 is formed in the direction of the first absorption axis (direction of arrow B), the first region 102a has a polarization direction in the direction of the second absorption axis (direction of arrow C). The first light source 21 transmits, but the second light source 22 having the polarization direction in the direction of the first absorption axis (the arrow B direction) does not transmit. Therefore, the 1st illumination light 21a permeate | transmits the 1st area | region 102a. Moreover, the 1st illumination light 21a permeate | transmits the duplication area | region 300 which is a 3rd area | region. On the other hand, the 1st illumination light 21a does not permeate | transmit the light-shielding part 110 and the 2nd area | region 202a. Accordingly, as shown in FIG. 1B, only the note mark portion 102 is displayed on the display panel 100, and the other portions are not displayed.
（表示板１００に矢印マーク部２０２を表示する場合）
図１（ａ）で示す表示装置１において、第２光源２２を点灯させ、第１光源２１を消灯させる。表示板１００は、表示板１００の第１吸収軸の方向（矢印Ｂ方向）に偏光方向を有する第２光源２２のみで照明される。矢印マーク部２０２の第２領域２０２ａは、第２吸収軸の方向（矢印Ｃ方向）にブレード部４０２が形成されているので、第１吸収軸の方向（矢印Ｂ方向）に偏光方向を有する第２光源２２は透過するが、第２吸収軸の方向（矢印Ｃ方向）に偏光方向を有する第１光源２１は透過しない。よって、第２照明光２２ａは、第２領域２０２ａを透過する。また、第２照明光２２ａは、第３領域である重複領域３００を透過する。一方、第２照明光２２ａは、遮光部１１０及び第１領域１０２ａは透過しない。これにより、図１（ｃ）で示すように、表示板１００において、矢印マーク部２０２のみが表示され、それ以外の部分は表示されない。
(When the arrow mark part 202 is displayed on the display board 100)
In the display device 1 shown in FIG. 1A, the second light source 22 is turned on and the first light source 21 is turned off. The display panel 100 is illuminated only by the second light source 22 having a polarization direction in the direction of the first absorption axis of the display panel 100 (arrow B direction). Since the blade region 402 is formed in the second absorption axis direction (arrow C direction), the second region 202a of the arrow mark portion 202 has a polarization direction in the first absorption axis direction (arrow B direction). The two light sources 22 transmit, but the first light source 21 having the polarization direction in the direction of the second absorption axis (the direction of arrow C) does not transmit. Accordingly, the second illumination light 22a passes through the second region 202a. Moreover, the 2nd illumination light 22a permeate | transmits the overlapping area | region 300 which is a 3rd area | region. On the other hand, the 2nd illumination light 22a does not permeate | transmit the light-shielding part 110 and the 1st area | region 102a. Thereby, as shown in FIG.1 (c), only the arrow mark part 202 is displayed on the display board 100, and a part other than that is not displayed.
（表示板１００の製造方法）
表示板１００は、基板４００を準備する基板準備工程と、基板４００の第１領域１０２ａにおいて、偏光機能を有するように第１吸収軸の方向（矢印Ｂ方向）に偏光微細加工を行なうと共に、基板４００の第２領域２０２ａにおいて、偏光機能を有するように第１吸収軸と直交する第２吸収軸の方向（矢印Ｃ方向）に偏光微細加工を行なう偏光微細加工工程と、を有して構成されている。この偏光微細加工工程は、以下に示すような加工方法により、同時に加工を行なうが、第１領域１０２ａの偏光微細加工工程と、第２領域２０２ａの偏光微細加工工程とを別工程として加工することも可能である。
(Manufacturing method of the display board 100)
The display panel 100 performs substrate polarization processing in the first absorption axis direction (arrow B direction) so as to have a polarization function in the substrate preparation step for preparing the substrate 400, and in the first region 102a of the substrate 400. The second region 202a of 400 includes a polarization micromachining step for performing polarization micromachining in the direction of the second absorption axis (arrow C direction) orthogonal to the first absorption axis so as to have a polarization function. ing. This polarization micromachining process is performed simultaneously by the following processing method, but the polarization micromachining process of the first region 102a and the polarization micromachining process of the second region 202a are processed as separate processes. Is also possible.
なお、第３領域である重複領域３００は、偏光微細加工により、ブレード部を形成しない加工により、所定の深さまで除去する第３加工工程としてもよい。また、加工せずに基板のまま使用することも可能である。 Note that the overlapping region 300, which is the third region, may be a third processing step of removing to a predetermined depth by processing without forming the blade portion by polarization microprocessing. It is also possible to use the substrate as it is without processing.
偏光微細加工は、電子ビーム描画装置、フォトリソグラフィー等により微細加工される。電子ビーム描画装置、フォトリソグラフィー等による偏光微細加工は、ガラス基板４００ａ、金属層４００ｂに対してナノオーダー（例えば、５０ｎｍ程度）の微細加工が可能である。本実施の形態では、電子ビーム描画装置を使用する。 The polarization microfabrication is microfabricated by an electron beam drawing apparatus, photolithography, or the like. Polarization microfabrication by an electron beam drawing apparatus, photolithography, or the like can be performed on the glass substrate 400a and the metal layer 400b in nano-order (for example, about 50 nm). In this embodiment, an electron beam drawing apparatus is used.
電子ビーム描画装置（電子ビーム露光装置、ＥＢ(electron beam)露光装置）は、電子線加工装置と走査型電子顕微鏡を応用したものである。電子銃から発せられた電子線を電子レンズやアパーチャー、デフレクタなどを通し、Ｘ−Ｙ−Ｚステージを微細に制御しながらマスクブランクスへ照射して目的のパターンを基板４００へ露光する。本実施の形態では、ガラス基板４００ａ上に金属層４００ｂ（例えば、Ｃｒ、Ａｌ）を形成し、その上にレジスト層を形成する。電子ビーム描画装置により、レジスト層を所定のパターンで加工し、残ったレジスト層をマスクとして、金属層４００ｂを除去する。これにより、ブレード部を形成することで、偏光機能をもたせる。このパターンは、本実施の形態では、第１領域１０２ａ、第２領域２０２ａのブレード部を形成して偏光機能を形成するパターンとして設定される。これらの工程において、第１領域１０２ａ、第２領域２０２ａ、重複領域３００、及び、遮光部１１０は、同時に加工される。 An electron beam drawing apparatus (electron beam exposure apparatus, EB (electron beam) exposure apparatus) is an application of an electron beam processing apparatus and a scanning electron microscope. An electron beam emitted from an electron gun is passed through an electron lens, an aperture, a deflector, and the like, and is irradiated onto a mask blank while finely controlling an XYZ stage to expose a target pattern onto the substrate 400. In this embodiment, a metal layer 400b (for example, Cr or Al) is formed over the glass substrate 400a, and a resist layer is formed thereover. The resist layer is processed with a predetermined pattern by an electron beam drawing apparatus, and the metal layer 400b is removed using the remaining resist layer as a mask. Thereby, the polarization function is provided by forming the blade portion. In the present embodiment, this pattern is set as a pattern for forming the polarization function by forming the blade portions of the first region 102a and the second region 202a. In these steps, the first region 102a, the second region 202a, the overlapping region 300, and the light shielding unit 110 are processed at the same time.
（本発明の実施の形態の効果）
本実施の形態に係る表示装置、製造方法は以下のような効果を有する。
（１）本実施の形態に係る表示装置は、吸収軸の方向が異なることで偏光方向が異なる複数の領域を有して表示領域が構成される表示板１００と、第１吸収軸Ｂの方向、又は、第１吸収軸Ｂと直交する第２吸収軸Ｃの方向に偏光方向を有する照明光を照射する光源２０と、を有し、表示領域は、第１吸収軸Ｂの方向に偏光微細加工された領域を有する第１領域１０２ａと、第２吸収軸Ｃの方向に偏光微細加工された領域を有する第２領域２０２ａと、照明光が透過する第３領域である重複領域３００と、により構成され、第２吸収軸Ｃの方向に偏光方向を有する照明光の照射により第１領域１０２ａ及び第３領域である重複領域３００のみを前記表示板１００に表示し、第１吸収軸Ｂの方向に偏光方向を有する照明光の照射により第２領域２０２ａ及び第３領域である重複領域３００のみを表示板１００に表示する、ように構成する。これにより、第１光源２１、第２光源２２により異なる偏光状態の照明光を１枚の表示板１００に照射することで、表示切替えを行なうことができる。この表示切替えは、同一色、例えば、白―白で異なる表示の切替えが可能となる。
（２）このように１枚の表示板１００で白―白表示を切替えるスイッチが可能となり、例えば、車両のステアリングスイッチに適用すれば、２倍のスイッチ機能を付加することが可能になる。
（３）白―白表示等の同色表示切替における利点とし、ディスプレイよりも単純な構造で安価、ヨウ素系や染料系の偏光板は２枚必要だが本実施の形態では１枚で可能、ヨウ素系や染料系の偏光板は強度が弱いが本実施の形態では強度が優れる、また、本実施の形態に係る表示板１００は無機物でできるので環境変化に強く安定している、等が挙げられる。
（４）従来の表示偏光板では、表示図形あるいは文字等を切り欠いて透光部を形成するので、切り欠いた部分と切り欠かない部分との透過率が異なり、表示図形あるいは文字等のコントラストに影響して表示性能が低下していた。しかし、本実施の形態に係る表示装置は、１枚の表示板１００上の、第１領域１０２ａ、第２領域２０２ａ、及び第３領域である重複領域３００の透過率をほぼ同じにできるので、マーク部を高品質で表示でき、表示性能に優れた表示装置が可能となる。
(Effect of the embodiment of the present invention)
The display device and the manufacturing method according to the present embodiment have the following effects.
(1) The display device according to the present embodiment includes a display plate 100 having a plurality of regions having different polarization directions due to different absorption axis directions, and a direction of the first absorption axis B. Or a light source 20 that irradiates illumination light having a polarization direction in the direction of the second absorption axis C orthogonal to the first absorption axis B, and the display region is finely polarized in the direction of the first absorption axis B. A first region 102a having a processed region, a second region 202a having a region finely polarized in the direction of the second absorption axis C, and an overlapping region 300 that is a third region through which illumination light is transmitted. Only the first region 102a and the overlapping region 300, which is the third region, are displayed on the display panel 100 by irradiation with illumination light having a polarization direction in the direction of the second absorption axis C, and the direction of the first absorption axis B The second region 2 is irradiated with illumination light having a polarization direction. Only 2a and overlapping region 300 is a third area to display on the display panel 100, configured to. Thereby, the display switching can be performed by irradiating one display plate 100 with illumination light having different polarization states by the first light source 21 and the second light source 22. In this display switching, it is possible to switch between different displays of the same color, for example, white-white.
(2) As described above, a switch for switching between white and white display can be performed by one display panel 100. For example, when the switch is applied to a steering switch of a vehicle, a double switch function can be added.
(3) Advantages in switching the same color display such as white-white display, etc., simpler and cheaper than the display, two iodine-based or dye-based polarizing plates are required, but in this embodiment one is possible, iodine-based In addition, although the strength of the polarizing plate of the dye type is weak, the strength is excellent in the present embodiment, and the display panel 100 according to the present embodiment is made of an inorganic material, so that it is strong and stable against environmental changes.
(4) In the conventional display polarizing plate, the translucent part is formed by cutting out the display figure or characters, so the transmittance of the cut out part and the part not cut out is different, and the contrast of the display figure or the character is different. The display performance was degraded due to However, the display device according to the present embodiment can make the transmittance of the first region 102a, the second region 202a, and the overlapping region 300, which is the third region, on the single display panel 100 substantially the same. The mark portion can be displayed with high quality, and a display device with excellent display performance is possible.
以上、本発明のいくつかの実施の形態を説明したが、これらの実施の形態は、一例に過ぎず、特許請求の範囲に係る発明を限定するものではない。これら新規な実施の形態は、その他の様々な形態で実施されることが可能であり、本発明の要旨を逸脱しない範囲で、種々の省略、置き換え、変更等を行うことができる。また、これら実施の形態の中で説明した特徴の組合せの全てが発明の課題を解決するための手段に必須であるとは限らない。さらに、これら実施の形態は、発明の範囲及び要旨に含まれるとともに、特許請求の範囲に記載された発明とその均等の範囲に含まれる。 As mentioned above, although some embodiment of this invention was described, these embodiment is only an example and does not limit the invention which concerns on a claim. These novel embodiments can be implemented in various other forms, and various omissions, replacements, changes, and the like can be made without departing from the scope of the present invention. In addition, not all the combinations of features described in these embodiments are essential to the means for solving the problems of the invention. Furthermore, these embodiments are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof.
１…表示装置
２０…光源
２１…第１光源
２１ａ…第１照明光
２２…第２光源
２２ａ…第２照明光
１００…表示板
１１０…遮光部
１０２…音符マーク部
１０２ａ…第１領域
２０２…矢印マーク部
２０２ａ…第２領域
３００…重複領域
４００…基板
４００ａ…ガラス基板
４００ｂ…金属層
Ｂ…第１吸収軸の方向の方向（矢印Ｂ方向）
Ｃ…第２吸収軸の方向の方向（矢印Ｃ方向）
DESCRIPTION OF SYMBOLS 1 ... Display apparatus 20 ... Light source 21 ... 1st light source 21a ... 1st illumination light 22 ... 2nd light source 22a ... 2nd illumination light 100 ... Display board 110 ... Shading part 102 ... Musical note mark part 102a ... 1st area | region 202 ... Arrow Mark portion 202a ... second region 300 ... overlap region 400 ... substrate 400a ... glass substrate 400b ... metal layer B ... direction of first absorption axis (arrow B direction)
C: Direction in the direction of the second absorption axis (direction of arrow C)
Claims (4)
第１吸収軸の方向、又は、前記第１吸収軸と直交する第２吸収軸の方向に偏光方向を有する照明光を照射する光源と、を有し、
前記表示領域は、前記第１吸収軸の方向に偏光微細加工された領域を有する第１領域と、前記第２吸収軸の方向に偏光微細加工された領域を有する第２領域と、前記照明光が透過する第３領域と、により構成され、
前記第２吸収軸の方向に偏光方向を有する前記照明光の照射により前記第１領域及び前記第３領域のみを前記表示板に表示し、
前記第１吸収軸の方向に偏光方向を有する前記照明光の照射により前記第２領域及び前記第３領域のみを前記表示板に表示することを特徴とする表示装置。 A display plate having a plurality of regions having different polarization directions due to different absorption axis directions, and a display region;
A light source that irradiates illumination light having a polarization direction in the direction of the first absorption axis or in the direction of the second absorption axis orthogonal to the first absorption axis;
The display area includes a first area having an area finely polarized in the direction of the first absorption axis, a second area having an area finely polarized in the direction of the second absorption axis, and the illumination light. A third region through which is transmitted,
Only the first region and the third region are displayed on the display plate by irradiation with the illumination light having a polarization direction in the direction of the second absorption axis,
A display device, wherein only the second region and the third region are displayed on the display plate by irradiation with the illumination light having a polarization direction in a direction of the first absorption axis.
前記基板の第１領域において、偏光機能を有するように第１吸収軸の方向に偏光微細加工を行なうと共に、前記基板の第２領域において、偏光機能を有するように前記第１吸収軸と直交する第２吸収軸の方向に偏光微細加工を行なう偏光微細加工工程と、
を有することを特徴とする表示板の製造方法。 A substrate preparation process for preparing a substrate;
In the first region of the substrate, polarization fine processing is performed in the direction of the first absorption axis so as to have a polarization function, and in the second region of the substrate, the first absorption axis is orthogonal to have a polarization function. A polarization micromachining process for performing polarization micromachining in the direction of the second absorption axis;
A method for producing a display board, comprising:
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| US16/089,018 US10502394B2 (en) | 2016-04-21 | 2017-03-31 | Display device and method for manufacturing display board |
| PCT/JP2017/013656 WO2017183423A1 (en) | 2016-04-21 | 2017-03-31 | Display device and method for manufacturing display board |
| DE112017002124.3T DE112017002124T5 (en) | 2016-04-21 | 2017-03-31 | Display device and method for producing a display panel |
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| WO2020110361A1 (en) * | 2018-11-26 | 2020-06-04 | 株式会社東海理化電機製作所 | Display board and display device |
| WO2020110362A1 (en) * | 2018-11-26 | 2020-06-04 | 株式会社東海理化電機製作所 | Display board and display device |
| JP2020091458A (en) * | 2018-11-26 | 2020-06-11 | 株式会社東海理化電機製作所 | Display board and display device |
| JP2020091459A (en) * | 2018-11-26 | 2020-06-11 | 株式会社東海理化電機製作所 | Display board and display device |
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| US2165974A (en) * | 1938-05-20 | 1939-07-11 | Polaroid Corp | Display device employing polarized light |
| JPS4911957Y1 (en) * | 1965-08-05 | 1974-03-23 | ||
| JPS6125002Y2 (en) | 1978-01-30 | 1986-07-28 | ||
| JPH0781832B2 (en) | 1984-07-13 | 1995-09-06 | 松下電器産業株式会社 | Parts detector |
| EP1003078A3 (en) * | 1998-11-17 | 2001-11-07 | Corning Incorporated | Replicating a nanoscale pattern |
| JP3229871B2 (en) * | 1999-07-13 | 2001-11-19 | 松下電器産業株式会社 | Method for transferring fine shape and method for manufacturing optical component |
| GB2496667B (en) * | 2011-11-18 | 2013-10-30 | Visteon Global Tech Inc | Dual graphic display |
| KR20130086701A (en) * | 2012-01-26 | 2013-08-05 | 삼성디스플레이 주식회사 | Polarization structures, methods of manufacturing polarization structures and organic light emitting display devices having polarization structures |
| JP6608422B2 (en) * | 2014-03-25 | 2019-11-20 | ザ ガバメント オブ ザ ユナイテッド ステイツ，アズ リプリゼンティッド バイ ザ セクレタリー オブ ジ アーミー | Non-toxic adjuvant formulation comprising monophosphoryl lipid A (MPLA) -containing liposome composition and saponin |
| KR20170072426A (en) * | 2015-12-16 | 2017-06-27 | 삼성디스플레이 주식회사 | Display apparatus |
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| WO2020110361A1 (en) * | 2018-11-26 | 2020-06-04 | 株式会社東海理化電機製作所 | Display board and display device |
| WO2020110362A1 (en) * | 2018-11-26 | 2020-06-04 | 株式会社東海理化電機製作所 | Display board and display device |
| JP2020091458A (en) * | 2018-11-26 | 2020-06-11 | 株式会社東海理化電機製作所 | Display board and display device |
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| US20190128505A1 (en) | 2019-05-02 |
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